ENS 51128
ENS Event | |
|---|---|
23:30 May 24, 2015 | |
| Title | 60-Day Optional Telephonic Notification for an Invalid Actuation of Containment Isolation Valves |
| Event Description | The following was received via phone call and email:
This 60-day report, as allowed by 10CFR 50.73(a)(1), is being made pursuant to 10CFR 50.73(a)(2)(iv)(A) to describe an unplanned, invalid actuation of containment isolation valves. At 1930 EDT on May 24, 2015, a loss of power to Reactor Protection System (RPS) Train B occurred. Initial investigation found the RPS Motor Generator (MG) Set B not running, with its Motor Off light illuminated caused by both Normal EPA breakers and MG Set B output breaker being tripped. Visual inspection at the distribution cabinet was inconclusive at the time and revealed no abnormalities and no abnormal odors in the area. Further investigation of the RPS MG Set B verified normal voltages on all fuse clips, and all power and control power fuses were operational. As a result of the loss of RPS B, the following containment isolation valves closures occurred: Reactor Water Cleanup (RWCU) Outboard Isolation valves, Torus Water Management System (TWMS) Outboard Isolation valves, Division 2 Drywell Pneumatics Inboard and Outboard Isolation valves, Primary Containment Radiation Monitoring System Inboard and Outboard Isolation valves, Reactor Recirculation Pump Seal Purge Flow Outboard Isolation valves, and Drywell Floor and Equipment Drain Sump Inboard Isolation Valves. The Resident Inspector has been notified. |
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+278.82 h11.618 days <br />1.66 weeks <br />0.382 months <br />) | |
| Opened: | Warren Paul 14:19 Jun 5, 2015 |
| NRC Officer: | Nestor Makris |
| Last Updated: | Jun 5, 2015 |
| 51128 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 528592017-03-24T19:48:00024 March 2017 19:48:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation During Testing ENS 511282015-05-24T23:30:00024 May 2015 23:30:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of Containment Isolation Valves ENS 501122014-03-19T00:30:00019 March 2014 00:30:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of Containment Isolation Valves ENS 438502007-10-22T23:30:00022 October 2007 23:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 438402007-10-14T07:00:00014 October 2007 07:00:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Actuation of Emergency Diesel Generator ENS 424282006-02-10T16:20:00010 February 2006 16:20:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuations ENS 408992004-05-30T14:40:00030 May 2004 14:40:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves Due to Partial Loss of 120 Vac Modular Power Unit 2 Loads 2017-03-24T19:48:00 | |